touchkit_ps2.c
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/* ----------------------------------------------------------------------------
* touchkit_ps2.c -- Driver for eGalax TouchKit PS/2 Touchscreens
*
* Copyright (C) 2005 by Stefan Lucke
* Copyright (C) 2004 by Daniel Ritz
* Copyright (C) by Todd E. Johnson (mtouchusb.c)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Based upon touchkitusb.c
*
* Vendor documentation is available at:
* http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf
*/
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include "psmouse.h"
#include "touchkit_ps2.h"
#define TOUCHKIT_MAX_XC 0x07ff
#define TOUCHKIT_MAX_YC 0x07ff
#define TOUCHKIT_CMD 0x0a
#define TOUCHKIT_CMD_LENGTH 1
#define TOUCHKIT_CMD_ACTIVE 'A'
#define TOUCHKIT_CMD_FIRMWARE_VERSION 'D'
#define TOUCHKIT_CMD_CONTROLLER_TYPE 'E'
#define TOUCHKIT_SEND_PARMS(s, r, c) ((s) << 12 | (r) << 8 | (c))
#define TOUCHKIT_GET_TOUCHED(packet) (((packet)[0]) & 0x01)
#define TOUCHKIT_GET_X(packet) (((packet)[1] << 7) | (packet)[2])
#define TOUCHKIT_GET_Y(packet) (((packet)[3] << 7) | (packet)[4])
static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
{
unsigned char *packet = psmouse->packet;
struct input_dev *dev = psmouse->dev;
if (psmouse->pktcnt != 5)
return PSMOUSE_GOOD_DATA;
input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
input_sync(dev);
return PSMOUSE_FULL_PACKET;
}
int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
{
struct input_dev *dev = psmouse->dev;
unsigned char param[3];
int command;
param[0] = TOUCHKIT_CMD_LENGTH;
param[1] = TOUCHKIT_CMD_ACTIVE;
command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
if (ps2_command(&psmouse->ps2dev, param, command))
return -ENODEV;
if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
param[2] != TOUCHKIT_CMD_ACTIVE)
return -ENODEV;
if (set_properties) {
dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;
dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
psmouse->vendor = "eGalax";
psmouse->name = "Touchscreen";
psmouse->protocol_handler = touchkit_ps2_process_byte;
psmouse->pktsize = 5;
}
return 0;
}